Abstract: A flexible spine having a number of pivotally connected spine modules. A first detent lock portion included on a first spine module and a second detent lock portion included on a second adjacent spine module for releasably interlocking adjacent spine modules. An accessory channel included in at least one of the spine modules. An accessory module including a hinge connector adapted for being received into the accessory channel and carrying an accessory panel. At least one retainer prong disposed in the accessory channel engaging the hinge connector for resisting movement of the hinge connector in the accessory channel.